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(No Model.) 3 Sheets-Sheet 1. U. CUMMINGS.

ORE URUSHER. No. 324,664. Patented Aug. 18, 1885.

n. PETERS, Phomuthognphur, Wnhmglon, n. c.

(No Model.) 3 Sheets-Sheet 2'. U. CUMMINGS.

ORE GRUSHER.

No. 324,664. Patented Aug. 18, 1885.,

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N. PETERS, PhMo-Lilhogmpher, Wnhlngion, n. a

3 Sheets-Sheet 3. U. CUMMINGS.

ORE ORUSHER.

(No Model.)

Patented Aug. 18, 1885.

NITED STATES PATENT OFFICE.

URIAH CUMMINGS, or BUFFALO, NEW YonK.

ORE-CRUSH ER.

SPECIFICATION forming part of Letters Patent No. 324,664, dated August18, 1885.

' Application filed November 11, 1891. (No model.)

To all whom it may concern;

Be it known that I, URIAH CUMMINGS, of the city of Buffalo, in thecounty of Erie and State of New York, have invented new and usefulImprovement-s in Ore Crushers, of which the following is aspecification.

This invention relates to an improvement in that class of orecrusherswhich consist of a rotating pan or bed-plate and crushing'rollersbearing upon such pan or bed-plate, and which are provided with anannular screen surrounding the bed-plate.

The object of my invention is to improve the construction of the pan andsifter.

My invention consists, to these ends, of the improvements which will behereinafter fully set forth,and pointed out in the claims.

In the accompanying drawings, consisting of three sheets, Figure l is apartly sectional elevation of my improved ore-crusher. Fig.2 is asectional top plan view of the same. Fig. 3 is an end elevation thereof.Fig. 4 is a fragmentary sectional elevation, on an enlarged scale, ofthe pan and one of the crushingrollers. Fig. 5 is a fragmentary top planView of the pan. Fig. 6 is a horizontal section in line 00 as, Fig. 5.Fig. 7 isa perspective view of two of the bars of the annular sifter.Fig. 8 is a sectional elevation, on an enlarged scale, of one of theroller-bearings.

Like letters of reference refer to like parts in the several figures.

A represents'the sills or bed-pieces of the stationary frame of themachine, A the upright posts resting thereon, and A horizontal piecesconnecting the upper ends of theposts A.

B represents the rotating pan or bed-plate, secured in the usual mannerto the upright shaft 1), which is provided at its lower end with a step,b, resting in a bearing, b secured to the bedsills A. I) is a bearingsupporting the upper end of the shaft b,,and attached to a cross piece,b connecting the horizontal top pieces, A.

O 0 represent the two crushing-rollers, arranged ondiametrically-opposite sides of the vertical shaft 1), so as to bearupon the bedplate B. The latter is composed of a suitable number ofsections-four being shown in the drawingswhich are provided on theirunder sides with radial ribs or flanges (Z, secured together byscrew-bolts, and forming at the center a hub, d, which rests upon acollar, d", which is secured to the shaft b, and whereby the bed.

plate is supported. The flanges d serve to stiffen the bed-plate andpermit a lighter plate to be used without sacrificing strength; and asthe bed-plate is made in sections, each section can be readily renewedif a breakage occurs, thereby avoiding the necessity of replacing theentire bed-p1ate,which is the casein bed-plates cast in one piece, asthey are usually made.

6 are radial arms secured with their inner ends to the under side of thebed-plate B, and extending outwardly therefrom for the purpose ofsupporting the annular sifter E, which surrounds the bed-plate.

e are recessed segmental frames resting on the arms 6 and the bed-plateB.

f are radial bars resting on the frames 0, and constituting a grate,through which the material which has been reduced to the proper degreeof fineness passes, while the coarse fragments remain on the grate. Thebars f are tapered lengthwise and provided at their ends with lateralprojections f, whereby the bodies of the bars are kept at the properdistance apart to form intervening slots of uniform width. As the barsare also tapering in cross-section in such manner that the openingsbetween the bars flare downwardly, in order to facilitate the dischargeof the material, the wearing away of the upper surface of the barscauses in course of time an enlargement of the openings, which affectsthe separation. In order to reduce these openings to the proper widthwhen such wear has occurred, it is only necessary to grind off theprojections f, whereby the bars will be brought closer together.

Heretofore the annular sifter or screen has been composed of perforatedplates, each of whichwas cast in one piece. When these plates becomeworn to such an extent as to enlarge the slots or perforations in thesame, they have to be removed and replaced by new plates, which involvesconsiderable expense and loss of time. All of this is avoided in myimproved construction.

The bars f are preferably chilled on their upper or face sides, and willtherefore last a long time without requiring any adj ustment,

and if they are adj usted more closely together the open spaces formedin the frames e, are filled with an additional bar or a simple strip ofmetal.

G is a hoop or cylindrical rim secured to the outer ends of the arms 6,for the purpose of confining the material on the sifter E.

g is a gear-rim secured to the outer side of the hoop G, and h is agear-pinion which meshes with the teeth of the rim 9 and rotates thelatter. The pinion h is secured to the inner end of a horizontal shaft,11-, which is providedwith a driving-pulley, H. The rim g is composedof'segments, in order to facilitate the operations of casting andsecuring it in place.

i represents the vertical scraper-plates,

which are arranged above the bed-plate B and l screen E, and whereby thecoarse material which has not passed through the screen is broughtwithin reach of the rollers.

The rollers C O are secured to two disconnected independent horizontalshafts, jj, each of which is supported in two independent bearings, 70,which are capable of vertical movement in grooves or ways it, formed'inhorizontal pieces K on both sides of each roller. The pieces K aresecured between horizontal pieces K, which co'nnectthe posts A.

Z represents springs, which press upon the roller-bearings and tend tohold the rollers down upon the bed-plate- Z represents set-screwsworking in bridgepieces 1 secured to the horizontal pieces K, andbearing upon followers m, which embrace the upper ends of the springs I,so that by adjusting the set-screws Z the tension of the springs and thepressure which they exert upon the rollers can be increased or lessenedas may be desired.

The material is fed upon the bed-plateB by a spout, which receives thematerial from the preliminary cracker or disintegrator, when such adevice is used, and the ground material, which passes through the screenE, falls upon the tight bottom 0, and is removed there from anddelivered into the discharge-spout 0 by scrapers 0, which are attachedto the lower side of the pan.

My machine is especially designed for grinding cement; but it may alsobe used advantageously for grinding lime, plaster, phos- .phates, ores,and other hard'substances.

. 1 claim as my invention- 1. 'In a crushing-machine, a circular panprovided with an annular screen surrounding the bed-plate, and composedof detachable bars tapering lengthwise and arranged radially side byside, substantially as set forth.

2. In a crushing-machine, a circular pan provided with an annular screensurrounding 4. Thecombination, with the bed-plate B,

composed of sections provided on their under sides with ribs d, of armse, extending outwardly from the bed-plate, frames 0, and screen-bars f,resting on said frames, substantially as set forth.

itness my hand this 8th day of November, 1884.

U. CUMMINGS.

VVi tn esscs:

J NO. J. BONNER, CARL F. GEYER.

